I have a 24'' external display attached to a 2lb notebook. I like my small and lightweight notebook for traveling, but for longer stretches of work I like to have the big screen, too.
It has a DVI port...
[edit]: oh gocha.
I know, I was replying to the "why desktop mode" post. But perhaps I misunderstood it.
I like the significant separation between monitor and keyboard and mouse.. it feels more comfortable and ergonomic to me. I do enjoy hacking on a laptop on a sofa.. but not for more than 2-3 hours.